1Heat oven to 350°F. Place black paper baking cup in each of 24 regular-size muffin cups. Make and bake cake mix as directed on box for 24 cupcakes, using water, oil and eggs. Cool 10 minutes; remove from pans to cooling racks. Cool completely, about 30 minutes.
2Frost cupcakes with white frosting. Sprinkle each with 1 teaspoon graham cracker crumbs to look like dirt. With black decorating gel, pipe desired design on each cookie half. Insert 1 half into each cupcake to look like tombstone.